DERIVATIVE INSTRUMENTS (TABLES)

9 Months Ended

Sep. 30, 2012

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]

Fair values of derivative instruments on the consolidated balance sheet (in millions):

	September 30, 2012			December 31, 2011
Derivative Instruments Not Designated as Hedges
Fuel hedge contracts
Fuel hedge contracts, current assets	$	35.4		$	46.7
Fuel hedge contracts, noncurrent assets	43.1			70.2
Fuel hedge contracts, current liabilities	—			(10.3		)
Derivative Instruments Designated as Hedges
Interest rate swaps
Other accrued liabilities	(6.0		)	(5.2		)
Other liabilities	(28.1		)	(23.6		)
Losses in accumulated other comprehensive loss (AOCL)	(34.1		)	(28.8		)

Schedule of Derivative Instruments, Gain (Loss) in Statement of Financial Performance [Table Text Block]

Pretax effect of derivative instruments on earnings (in millions):

	Three Months Ended September 30,						Nine Months Ended September 30,
	2012			2011			2012			2011
Derivative Instruments Not Designated as Hedges
Fuel hedge contracts
Gains (losses) recognized in aircraft fuel expense	$	21.7		$	(82.7	)	$	(41.2	)	$	(42.6	)
Derivative Instruments Designated as Hedges
Interest rate swaps
Losses recognized in aircraft rent	(1.5		)	(1.5		)	(4.4		)	(4.6		)
Losses recognized in other comprehensive income (OCI)	(3.6		)	(19.8		)	(9.7		)	(24.0		)